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Difference between revisions of "mirc/identifiers/$bitoff"
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| − | {{mirc title|$bitoff | + | {{mirc title|$bitoff identifier}}'''$bitoff''' returns N with the Bth bit set to 0. |
| − | '''$bitoff''' returns N with the Bth bit set to 0. | ||
== Synopsis == | == Synopsis == | ||
| − | <pre>$bitoff(<N>,<B>) | + | <pre>$bitoff(<N>,<B>)</pre> |
| − | </pre> | + | |
== Parameters == | == Parameters == | ||
N = Base-10 Number in the range + 2^32-1 through -2^31+1<br /> | N = Base-10 Number in the range + 2^32-1 through -2^31+1<br /> | ||
B = Counting from the right-most bit, the bit position to set as 0 | B = Counting from the right-most bit, the bit position to set as 0 | ||
| + | |||
== Properties == | == Properties == | ||
| − | |||
None | None | ||
== Example == | == Example == | ||
| − | |||
<pre>//var %n 10 | echo -a $bitoff(%n,2) | <pre>//var %n 10 | echo -a $bitoff(%n,2) | ||
; returns 8 | ; returns 8 | ||
| Line 58: | Line 56: | ||
* [[List of identifiers - mIRC]] | * [[List of identifiers - mIRC]] | ||
{{mIRC identifier list}} | {{mIRC identifier list}} | ||
| + | [[Category:mIRC identifiers|bitoff]] | ||
Revision as of 06:18, 21 September 2017
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$bitoff returns N with the Bth bit set to 0.
Synopsis
$bitoff(<N>,<B>)
Parameters
N = Base-10 Number in the range + 2^32-1 through -2^31+1
B = Counting from the right-most bit, the bit position to set as 0
Properties
None
Example
//var %n 10 | echo -a $bitoff(%n,2) ; returns 8
Here's how the answer was calculated:
- Convert base-10 N to binary.
- Count 2 from the right
- That bit is set to 0
- Return the possibly altered number
//var %n 10 | echo -a $base(%n,10,2,32) | echo -a $str(-,24) $+ 87654321 | echo -a $base($bitoff(%n,2),10,2,32) $base(1000,2,10) ; returns: 00000000000000000000000000001010 ------------------------87654321 00000000000000000000000000001000 8
If N is 2^32 or greater, returns 2^32 -1
If N is less than -2^31+1, returns 2^(B-1) +1
Using $biton and $bitoff, you can store several variables as bits within a single variable, instead of creating a separate variable for each.
The /window switch -wN uses bit settings, with default 3 if N not used.
var %treebarsetting $true var %switchbarsetting $true var %n if (%switchbarsetting) var %n $biton(%n,1) if (%treebarsetting) var %n $biton(%n,2) if (%n == $null) var %n 3
Compatibility
Added: mIRC v5.61
Added on: 23 Sep 1999
Note: Unless otherwise stated, this was the date of original functionality.
Further enhancements may have been made in later versions.
See also
mIRC identifier list